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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

              <div class="container">
      <li><a href="#">item</a></li>
      <li><a href="#">item</a></li>
      <li><a href="#">item</a></li>
      <li><a href="#">item</a></li>
      <li><a href="#">item</a></li>
    <div class="main">
      <h1>Header App</h1>
      Lorem ipsum dolor sit amet, consectetur adipisicing elit. Praesentium tempora voluptatibus amet libero, nam velit placeat aut omnis eaque eius quaerat saepe, vero maiores. Optio sit obcaecati similique eos temporibus.
      <h3>working with flex box</h3>
      Lorem ipsum dolor sit amet, consectetur adipisicing elit. Veniam, et, facilis! Nemo consequuntur nesciunt, necessitatibus adipisci reiciendis sed debitis a minima inventore natus facilis modi, at dignissimos illum recusandae, ab.
      <div class="side">
        <h2>Header Side</h2>
        Lorem ipsum dolor sit amet, consectetur adipisicing elit. Sint nobis odit qui! Blanditiis asperiores, laborum explicabo itaque aut esse accusantium.
      <div class="side">
        <h2>Header Side</h2>
        Lorem ipsum dolor sit amet, consectetur adipisicing elit. Accusamus fugit provident reprehenderit, expedita consequuntur omnis laudantium.
              @import url('https://fonts.googleapis.com/css?family=Open+Sans');
$font: 'Open Sans', sans-serif;
$color: #ecf0f1;
$ground: #34495e;

  width: 80%;
  margin: 0 auto;
  font-family: $font;
  h1,h2,h3{ color: $ground; }
        display: flex;
        padding: 0;
          flex: 1 100%;
          list-style: none;
            padding: 2%;
            text-align: center;
            display: block;
            background: $ground;
            color: $color;
            text-decoration: none;
            border: 1px solid darken($ground, 10);
          }// a
        }// li
      } // ul
    }// nav
  }// header
    display: flex;
    flex-direction: row;
      padding: 0.5%;
      flex: 2;
    }// main
      padding: 0.5%;
      flex: 1;
  }// section
} // container

@media screen and(max-width: 600px){
      flex-direction: column;
      .main, aside{
        flex: 1;
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